In this paper, with the in-situ observations from the Time History of Events and Macroscale Interactions dur-ing Substorms (THEMIS) probes we report a wavy dipolar-ization front (DF) event, where the DF has different mag-netic structures and electron distributions at different y po-sitions in the Geocentric Solar Magnetospheric (GSM) co-ordinates. At y ∼ 2.1R E (R E is the radius of Earth), the DF has a relatively simple structure, which is similar to that of a E , the DF is revealed to have a multiple DF structure, where the plasma exhibits a vortex flow. Such a wavy DF could be the results of the interchange instability. The different structure of such a wavy DF at dif-ferent sites has a great effect on electron acceleration. Fermi acceleration can occur at the site of the DF with a simple or multiple DF structure, while betatron acceleration as a local
process has the contribution to energetic electrons only at the site of the DF with a simple structure.

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